IS/IEC 61730-2 : 2004

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Indian Standard PHOTOVOLTAIC (PV) MODULE SAFETY QUALIFICATION
PART 2 REQUIREMENTS FOR TESTING

ICS 27.160

© BIS 2010

B U R E AU O F I N D I A N S TA N DA R D S
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 February 2010 Price Group 11

Solar Photovoltaic Energy Systems Sectional Committee, ETD 28

NATIONAL FOREWORD This Indian Standard (Part 2) which is identical with IEC 61730-2 : 2004 `Photovoltaic (PV) module safety qualification -- Part 2: Requirements for testing' issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Solar Photovoltaic Energy Systems Sectional Committee and approval of the Electrotechnical Division Council. The text of the IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words `International Standard' appear referring to this standard, they should be read as `Indian Standard'. b) Comma (,) has been used as a decimal marker in the International Standard while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their respective places are listed below along with their degree of equivalence for the editions indicated: International Standard IEC 60060-1 : 1989 High-voltage test techniques -- Par t 1: General definitions and test requirements Corresponding Indian Standard IS 2071 (Part 1) : 1993 High-voltage test techniques: Part 1 General definitions and test requirements (second revision) IS 9001(Part 1) : 1984 Guidance for environmental testing: Part 1 General IS 10673 : 1983 Sampling plans and procedures for inspection by attributes for electronic items IS 15382 (Part 1) : 2003 Insulation co-ordination for equipment within low-voltage systems: Part 1 Principles, requirements and tests IS 12762 (Part 2) : 1993 Photovoltaic devices: Part 2 Requirements for reference solar cells IS/IEC 61032 : 2007 Protection of persons and equipment by enclosures -- Probes for verification Degree of Equivalence Identical

IEC 60068-1 Environmental testing -- Part 1: General and guidance IEC 60410 : 1973 Sampling plans and procedures for inspection by attributes

Technically Equivalent

do

IEC 60664-1 : 1992 1) Insulation co-ordination for equipment within low-voltage systems -- Par t 1: Principles, requirements and tests IEC 60904-2 : 1989 Photovoltaic devices -- Part 2: Requirements for reference solar cells IEC 61032 : 19972) Protection of persons and equipment by enclosures -- Probes for verification

do

Identical

Technically Equivalent

1) 2)

Since revised in 2002. Since revised in 2007.

(Continued on third cover)

IS/IEC 61730-2 : 2004

Indian Standard PHOTOVOLTAIC (PV) MODULE SAFETY QUALIFICATION
PART 2 REQUIREMENTS FOR TESTING

1

Scope and object

This part of IEC 61730 describes the testing requirements for photovoltaic (PV) modules in order to provide safe electrical and mechanical operation during their expected lifetime. Specific topics are provided to assess the prevention of electrical shock, fire hazards, and personal injury due to mechanical and environmental stresses. IEC 61730-1 pertains to the particular requirements of construction. This part of IEC 61730 outlines the requirements of testing. This standard attempts to define the basic requirements for various application classes of photovoltaic modules, but it cannot be considered to encompass all national or regional building codes. The specific requirements for marine and vehicle applications are not covered. This standard is not applicable to modules with integrated AC inverters (AC modules). This standard is designed so that its test sequence can co-ordinate with those of IEC 61215 or IEC 61646, so that a single set of samples may be used to perform both the safety and performance evaluation of a photovoltaic module design. The test-sequences of this standard are arranged in an optimal way so that tests of IEC 61215 or IEC 61646 can be used as basic preconditioning tests.
NOTE 1 The sequence of tests required in this standard may not test for all possible safety aspects associated with the use of PV modules in all possible applications. This standard utilizes the best sequence of tests available at the time of its writing. There are some issues, such as the potential danger of electric shock posed by a broken module in a high voltage system, that should be addressed by the systems design, location, restrictions on access and maintenance procedures.

The object of this document is to provide the testing sequence intended to verify the safety of PV modules whose construction has been assessed by IEC 61730-1. The test sequence and pass criteria are designed to detect the potential breakdown of internal and external components of PV modules that would result in fire, electric shock and personal injury. The standard defines the basic safety test requirements and additional tests that are a function of the module end-use applications. Test categories include general inspection, electrical shock hazard, fire hazard, mechanical stress, and environmental stress.
NOTE 2 The additional testing requirements outlined in relevant ISO standards, or the national or local codes which govern the installation and use of these modules in their intended locations, should be considered in addition to the requirements contained within this document.

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2

Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60060-1, High-voltage test techniques ­ Part 1: General definitions and test requirements IEC 60068-1, Environmental testing ­ Part 1: General and guidance IEC 60410, Sampling plans and procedures for inspection by attributes IEC 60664-1:1992, Insulation co-ordination for equipment within low-voltage systems ­ Part 1 Principles, requirements and tests Amendment 2 (2002) IEC 60904-2, Photovoltaic devices ­ Part 2: Requirements for reference solar cells IEC 60904-6, Photovoltaic devices ­ Part 6: Requirements for reference solar modules IEC 61032:1997, Protection of persons and equipment by enclosures ­ Probes for verification IEC 61140, Protection against electric shock ­ Common aspects for installation and equipment IEC 61215:2004, Crystalline silicon qualification and type approval terrestrial photovoltaic (PV) modules ­ Design

IEC 61646:1996, Thin-film terrestrial photovoltaic (PV) modules ­ Design qualification and type approval IEC 61730-1:2004, Photovoltaic (PV) module safety qualification ­ Part 1: Requirements for construction ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories ANSI/UL 514C, Non-metallic outlet boxes, flush device boxes and covers ANSI/UL 790, Tests for Fire Resistance of Roof Covering Materials ANSI/UL 1703, Flat ­ Plate Photovoltaic Modules and Panels ANSI Z97.1, American National Standard for Safety Glazing Materials Used in Buildings ­ Safety Performance Specifications and Methods of Test

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3

Application classes

3.1 General Photovoltaic modules may be installed in many different applications. Therefore, it is important to evaluate the potential hazards associated with those applications and to evaluate the construction of the module accordingly. Relevant safety requirements and necessary tests shall be performed to verify the conformance to the requirements of that application class. This clause defines those application classes and construction qualities required for each class. Application classes for PV-modules are defined as follows: 3.2 Class A: General access, hazardous voltage, hazardous power applications Modules rated for use in this application class may be used in systems operating at greater than 50 V DC or 240 W, where general contact access is anticipated. Modules qualified for safety through IEC 61730-1 and this part of IEC 61730 within this application class are considered to meet the requirements for safety class II. 3.3 Class B: Restricted access, hazardous voltage, hazardous power applications Modules rated for use in this application class are restricted to systems protected from public access by fences, location, etc. Modules evaluated within this application class provide protection by basic insulation, are considered to meet the requirements for safety class 0. 3.4 Class C: Limited voltage, limited power applications Modules rated for use in this application class are restricted to systems operating at less than 50 V DC and 240 W, where general contact access is anticipated. Modules qualified for safety through IEC 61730-1 and this part of IEC 61730 within this application class are considered to meet the requirements for safety class III.
NOTE Safety classes are defined within IEC 61140.

4

Test categories

4.1 General The following hazards might influence the lifetime and the safety of PV modules. In accordance with these hazards, test procedures and criteria are described. The specific tests to which a module will be subjected will depend on the end use application for which the minimum tests are specified in Clause 5.
NOTE Module safety tests are labelled MST.

Tables 1 to 6 show the origin of the required tests. For some tests, the third column shows for information the origin of the tests, but the appropriate test requirements are given in Clauses 10 and 11. The rest of the tests are based on or identical to IEC 61215/IEC 61646, and references to the relevant Clauses are given in the last two columns. Some of the IEC 61215/IEC 61646-based tests were modified for IEC 61730-2 and are included in Clauses 10 and 11.

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4.2 Preconditioning tests Table 1 ­ Preconditioning tests
Test MST 51 MST 52 MST 53 MST 54 Title Thermal cycling (TC50 or TC200) Humidity freeze (HF10) Damp heat (DH1000) UV preconditioning test References in Standards According to IEC 61215 10.11 10.12 10.13 10.10 IEC 61646 10.11 10.12 10.13 10.10

4.3 General inspection Table 2 ­ General inspection test
Test MST 01 Visual inspection Title References in Standards According to IEC 61215 10.1 IEC 61646 10.1

4.4 Electrical shock hazard tests These tests are designed to assess the risk to personnel due to shock or injury because of contact with parts of a module that are electrically energised as a result of design, construction, or faults caused by environment or operation. Table 3 ­ Electrical shock hazard tests
Test MST 11 MST 12 MST 13 Accessibility test Cut susceptibility test (not required for glass surfaces) Ground continuity test (not required unless metal framed) MST 14 MST 16 MST 17 MST 42 * Impulse voltage test Dielectric withstand test Wet leakage current test Robustness of terminations test IEC 60664-1 10.3* 10.15 10.14 10.3* 10.20 10.14 Title References in Standards ANSI/UL 1703 ANSI/UL 1703 ANSI/UL 1703 According to IEC 61215 IEC 61646

The pass/fail criteria differ from those given in IEC 61215 and IEC 61646.

4.5 Fire hazard tests These tests assess the potential fire hazard due to the operation of a module or failure of its components.

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Table 4 ­ Fire hazard tests
Test MST 21 MST 22 MST 23 MST 25 MST 26 Temperature test Hot-spot test Fire test Bypass diode thermal test Reverse current overload test ANSI/UL 1703 ANSI/UL 790 10.18 Title References in Standards ANSI/UL 1703 10.9 10.9 According to IEC 61215 IEC 61646

4.6 Mechanical stress tests These tests are to minimise potential injury due to mechanical failure. Table 5 ­ Mechanical stress tests
Test MST 32 MST 34 Title Module breakage test Mechanical load test References in Standards ANSI Z97.1 10.16 10.16 According to IEC 61215 IEC 61646

4.7 Component tests Table 6 ­ Component tests

Test MST 15 MST 33 MST 44

Title Partial discharge test Conduit bending Terminal box knock out test

References in Standards IEC 60664-1 ANSI/UL 514C ANSI/UL 514C

According to IEC 61215 IEC 61646

5

Application classes and their necessary test procedures

The specific tests to which a module will be subjected, depending on the application class defined in IEC 61730-1, is described in Table 7. The order in which the tests are carried out shall be in accordance with Figure 1. Some tests shall be carried out as preconditioning tests.
NOTE This test sequence has been designed so that IEC 61730-2 can be performed in conjunction with IEC 61215 or IEC 61646. In this way, the environmental stress tests in IEC 61215 or IEC 61646 can serve as the preconditioning tests for IEC 61730-2.

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Table 7 ­ Required tests, depending on the application class
Application class A B C Preconditioning tests: X X X X X X X X X X X X MST 51 Thermal cycling (T50 or T200) MST 52 Humidity freeze (10HF) MST 53 Damp heat (DH1000) MST 54 UV resistance General inspection test: X X X MST 01 Visual inspection Electrical shock hazard tests: X X X X X X X X X X X* X* X X X X MST 11 Accessibility test MST 12 Cut susceptibility test MST 13 Ground continuity test MST 14 Impulse voltage test MST 16 Dielectric withstand test MST 17 Wet leakage current test MST 42 Robustness of terminations test Fire hazard tests: X X X** X X X X X X MST 21 Temperature test MST 22 Hot spot test MST 23 Fire test MST 26 Reverse current overload test Mechanical stress tests: X X X X X MST 32 Module breakage test MST 34 Mechanical load test Component tests: X X X X * X X X MST 15 Partial discharge test MST 33 Conduit bending MST 44 Terminal box knockout test Tests

Test required. Test needs not be carried out. Different test levels for application classes A and B.

** Minimum fire resistance class C is necessary for building roof-mounted modules.

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6

Sampling

Six modules and a laminate 1 (a module without frame) for safety testing (plus spares as desired) and additional modules as required for the fire-test shall be taken at random from a production batch or batches, in accordance with the procedure given in IEC 60410. The modules shall have been manufactured from specified materials and components in accordance with the relevant drawings and process sheets and have been subjected to the manufacturer's normal inspection, quality control and production acceptance procedures. The modules shall be complete in every detail and shall be accompanied by the manufacturer's handling, mounting and connection instructions, including the maximum permissible system voltage. When the modules to be tested are prototypes of a new design and not from production, this fact shall be noted in the test report (see Clause 7).

7

Test report

The results shall be laid down in a test report according to ISO/IEC 17025. The results shall be reported, normally in a test report and shall include all the information requested by the client and necessary to the interpretation of the test and all information required by the method used: a) a title; b) name and address of the test laboratory and location where the tests were carried out; c) unique identification of the certification or report and of each page; d) name and address of client, where appropriate; e) description and identification of the item tested; f) characterization and condition of the test item; g) date of receipt of test item and date(s) of test, where appropriate; h) identification of test method used; i) j) reference to sampling procedure, where relevant; any deviations from, additions to or exclusions from the test method, and any other information relevant to a specific tests, such as environmental conditions;

k) measurements, examinations and derived results supported by tables, graphs, sketches and photographs as appropriate including maximum systems voltage, safety class, mounting technique and any failures observed; l) a statement indicating whether the impulse voltage test was performed on module or laminate;

m) a statement of the estimated uncertainty of the test results (where relevant); n) a signature and title, or equivalent identification of the person(s) accepting responsibility for the content of the certificate or report, and the date of issue; o) where relevant, a statement to the effect that the results relate only to the items tested; p) a statement that the certificate or report shall not be reproduced except in full, without the written approval of the laboratory. A copy of this report shall be kept by the manufacturer for reference purposes.

------------------ 1 If the module is only used with frame and the frame is an essential part to fulfil the isolation requirement, the laminate can be replaced by a module.

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8

Testing

The modules shall be divided into groups and subjected to the safety tests shown in Figure 1, carried out in the order specified. The modules shall be selected such that the preconditioning tests of 4.2 are met. Each box in Figure 1 refers to the corresponding subclause in this part of IEC 61730.
NOTE Spare modules may be included in the safety test program provided that they have been appropriately environmentally tested to meet the necessary prerequisites.

Test procedures and criteria, including initial and final measurements where necessary, are detailed in Clauses 10 and 11. Some tests are identical to tests in IEC 61215/IEC 61646 and are detailed in Clause 4 instead. In carrying out these tests, the tester shall strictly observe the manufacturer's handling, mounting, and connection instructions.

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IEC 61730

Module safety test MST 7 modules or 6 modules and 1 laminate

IEC 61215 IEC 61646 01 10.2 17

Module performance test MPT The numbers in each box are references to final measurements, that are to be performed after MST or MPT (if required). In this example: 01 = Module safety test MST 01 10.2 = Performance test (IEC 61215, IEC 61646) 17 = Module safety test MST 17 Visual inspection MST 01

Performance test 10.2 (IEC 61215, IEC 61646)

Component tests
11 pieces of foil

1 module

Control

Number of modules depends on the module size

1 module

3 modules 1 laminate Dielectric withstand test MST 16

1 module 1 piece of junction box

Ground continuity test MST 13 Partial discharge test MST 15

Test on 6 knock outs

Fire test MST 23

Module breakage test MST 32

Accessibility test MST 11

Wet leakage current test MST 17

Conduit bending test MST 33

1 module

1 module

1 module 1 laminate (module) Thermal cycling test 200 cycles MST 51a 01 10.2 16

Terminal box knock out test MST 44

UV-resistance test MST 54 01 10.2 16

Damp heat Heat test Test 1000 1 000h h MST 53 01 10.2 16

Thermal cycling test 50 cycles MST 51b 01 10.2 16

Wet leakage current test MST 17 01

16 Bypass diode thermal test MST 25 16 17

Humidity freeze test MST 52 01 10.2 16

Mechanical load test MST 34 01 10.2 17

laminate (module)

Temperature test MST 21

Robustness of terminations test MST 42 01 10.2 16 01

Hot-spot test MST 22 16 17

Impulse voltage test MST 14 01 16

Reverse current overload test MST 26 17

Cut susceptibility test MST 12 01 13 16 17

Accessibility test
MST 11

Visual inspection
MST 01

IEC 1357/04

Figure 1 ­ Test sequences

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9

Pass criteria

The module product under evaluation shall be judged to have passed the safety qualification test, if the test samples meet all of the criteria of each individual test. If any module does not meet these test criteria, the module product under evaluation shall be deemed not to have met the safety test requirements.
NOTE The nature of the failure will determine the extent of re-testing requirements.

10 Test procedures
10.1 Visual inspection MST 01 10.1.1 Purpose

To detect any visual defects in the module. 10.1.2 Procedure

This test is identical with 10.1 from IEC 61215/IEC 61646 with the additional inspection criteria of ­ ­ any other conditions which may affect safety; markings not consistent with Clause 11 of IEC 61730-1.

Make note of and/or photograph the nature and position of any cracks, bubbles or delaminations, etc. which may worsen and adversely affect the module safety in subsequent tests. Visual conditions other than the major defects listed below are acceptable for the purpose of safety test approval. 10.1.3 Pass criteria

For the purpose of the safety test approval, the following are considered to be major visual defects: a) broken, cracked, or torn external surfaces; b) bent or misaligned external surfaces, including superstrates, substrates, frames and junction boxes to the extent that the safety of the module would be impaired; c) bubbles or delaminations forming a continuous path between any part of the electrical circuit and the edge of the module, or which exhibited significant growth during the testing and would, if testing were continued, reach such a condition; d) evidence of any molten or burned encapsulant, back sheet, diode or active PV component; e) loss of mechanical integrity to the extent that the safety of the installation and operation of the module would be impaired; f) markings not complying with Clause 12 of IEC 61730-1.

10.2 Accessibility test MST 11 10.2.1 Purpose

To determine if uninsulated electrical connections represent a shock hazard to personnel.

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10.2.2

Apparatus

The apparatus is as follows: a) A cylindrical test fixture Type 11 according to Figure 7 of IEC 61032. b) An ohmmeter or continuity tester. 10.2.3 Procedure

The procedure is as follows: a) Mount and wire the test module as recommended by the manufacturer. b) Attach the ohmmeter or continuity tester to the module electric circuit and to the test fixture. c) Remove all covers, plugs and connections from the module that can be removed without using a tool. d) Probe with the test fixture in and around all electrical connectors, plugs, junction boxes and any other areas where the electrical circuit of the module may be accessible. e) Monitor the ohmmeter or continuity tester during the probing to determine if the test fixture makes electrical contact to the module electric circuitry. 10.2.4 None. 10.2.5 Requirements Final measurements

At no time during the test shall there be less than 1 M resistance between the test fixture and the module electric circuit. 10.2.6 Pass criteria

At no time during the test shall the probe contact any live electrical part. This test is performed at the beginning and the end of the sequence according to Figure 1, but also can be used at any time during the test sequence if there is any reason to believe that active electric circuitry has been exposed by one of the other tests. 10.3 Cut susceptibility test MST 12 10.3.1 Purpose

To determine whether any front and rear surfaces of the module made of polymeric materials are capable of withstanding routine handling during installation and maintenance without exposing personnel to the danger of electric shock. This test is derived from ANSI/UL 1703. 10.3.2 Apparatus

A test fixture as shown in Figure 2, designed to draw a defined shaped object, a 0,64 mm ± 0,05 mm thick carbon steel blade (for example the back of a hacksaw blade) over the surface of the module with an applied force of 8,9 N ± 0,5 N.

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10.3.3

Procedure

The procedure is as follows: a) Position the module horizontally with the front surface facing upward. b) The test fixture is to be placed on the surface for 1 min and then drawn across the surface of the module at a speed of (150 ± 30) mm/s. Repeat the procedure five times in different directions. c) Repeat a) and b) for the rear surface of the module. 10.3.4 Final measurements

Repeat MST 01, MST 13, MST 16 and MST 17. 10.3.5 Pass criteria

The pass criteria are as follows: a) No visual evidence that the superstrate or substrate surfaces have been cut, exposing the active circuitry of the module. b) MST 13, MST 16, MST 17 shall meet the same requirements as for the initial measurements.

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A

140°

B

Q

Test point carbon steel strip (i.e. hacksaw blade)

C

90°
IEC 1358/04

Key A B C Q 150 mm from axis to center of weight. 170 mm from axis to test point. Test point ­ 0,64 mm thick steel strip. Total force exerted at test point Q: 8,9 N

Figure 2 ­ Cut susceptibility test

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10.4 Ground continuity test MST 13 10.4.1 Purpose

To demonstrate that there is a conductive path between all exposed conductive surfaces of the module, so that the exposed conductive surfaces can be adequately grounded in a PV system. This test is required only if the module has exposed conductive parts such as a metal frame or a metallic junction box. 10.4.2 Apparatus

The apparatus is as follows: a) A constant current supply capable of producing a current that is 2,5 times the maximum over-current protection rating of the module under test. See MST 26. b) A suitable voltmeter.
NOTE According to IEC 61730-1 the maximum over-current protection rating has to be provided by the manufacturer.

10.4.3

Procedure

The procedure is as follows: a) Select the manufacturer's designated grounding point and recommended grounding connection. Attach to one terminal of the constant current supply. b) Select an adjacent (connected) exposed conductive component with the greatest physical displacement from the grounding point, and attach to the other terminal of the current supply. c) Attach the voltmeter to the two conductive components attached to the current supply in proximity to the current leads. d) Apply a current 2,5 times ± 10 % of the maximum over-current protection rating of the module for a minimum of 2 min. e) Measure the applied current and the resultant voltage drop. f) Reduce the current to zero. g) Repeat the test on one additional frame component. 10.4.4 None. 10.4.5 Pass criteria Final measurements

The resistance between the selected exposed conductive component and each other conductive component of the module shall be less than 0,1 . 10.5 Impulse voltage test MST 14 10.5.1 Purpose

To verify the capability of the solid insulation of the module to withstand over-voltages of atmospheric origin. It also covers over-voltages due to switching of low-voltage equipment.
NOTE If the PV module is not going to be sold without frame, the impulse voltage test should be done with the module framed.

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10.5.2

Apparatus

The apparatus is as follows: a) Impulse voltage generator. b) Oscilloscope. 10.5.3 Procedures

For the purposes of test reproducibility, this test is conducted under the conditions of room temperature and relative humidity of less than 75 %. The procedure is as follows: a) Cover the whole module with a copper foil. Connect the foil to the negative terminal of the impulse voltage generator. b) Connect the shorted output terminals of the module to the positive terminal of the impulse voltage generator. Specification of the foil: 1) Thickness copper 0,03 mm to 0,05 mm. 2) Conducting glue (conductivity <1 , measuring area: 625 mm 2 ). 3) Total thickness 0,05 mm to 0,07 mm. c) With no illumination, apply the surge impulse voltage given in Table 8 with a waveform as shown in Figure 3 by the impulse voltage generator. The waveform of the pulse shall be observed by an oscilloscope and the rise time and the pulse duration shall be checked for each test.
NOTE 1 According to 2.2.2.1.1 of IEC 60664-1, modules belong to the over-voltage category III. The testlevel has been reduced by one step because systems are normally equipped with over-voltage protection devices. On the other hand, to verify reinforced insulation (as required for application class A and safety class II), the level for application class A has been increased by one step.

Table 8 ­ Impulse voltage versus maximum system voltage
Maximum system voltage V Impulse voltage Application class A V Application class B V

100 150 300 600 1 000 NOTE 2

1 500 2 500 4 000 6 000 8 000

800 1 500 2 500 4 000 6 000

Linear interpolation is allowed for intermediate values of maximum system voltage.

d) Three successive pulses shall be applied. e) Change the polarity of the terminals of the pulse generator and apply three successive pulses.

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10.5.4

Final measurement

Repeat MST 01 visual inspection. 10.5.5 Pass criteria

The pass criteria are as follows: a) No evidence of dielectric breakdown or surface tracking of the module is observed during the test. b) No evidence of major visual defects as defined in 10.1.
Voltage 1,0 0,9 B

0,5 0,3 A

0 01

T' T T1 T2

Time

T1 = 1,2 s ± 30 % T2 = 50 s ± 20 %
IEC 1359/04

NOTE The parameter 0 1 is the start point of the impulse voltage. In a diagram with linear time scale this is the intersection point of the time axis and the line defined by points A and B.

Figure 3 ­ Wave-form of the impulse voltage according to IEC 60060-1 10.6 Dielectric withstand test MST 16 10.6.1 Purpose

To determine whether or not the module is sufficiently well insulated between current carrying parts and the frame or the outside world. The test shall be made on modules at ambient temperature of the surrounding atmosphere (see IEC 60068-1) and in a relative humidity not exceeding 75 %. 10.6.2 Procedure

This test is identical with test 10.3 from IEC 61215/IEC 61646 with test levels depending on the application class and the maximum system voltage. The maximum test voltage shall be equal to 2 000 V plus four times the maximum system voltage for application-class A and equal to 1 000 V plus two times the maximum system voltage for application-class B.

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10.6.3

Pass criteria

See IEC 61215/IEC 61646. 10.7 Temperature test MST 21 10.7.1 Purpose

This temperature test is designed to determine the maximum reference temperatures for various components and materials used to construct the module, in order to establish the suitability of their use. 10.7.2 Test conditions

The ambient temperature during the test may be in the range of 20 °C to 55 °C. The irradiance during the test shall be no less than 700 W/m 2 measured coplanar with the module by a calibrated device with the accuracy to ±5 % in accordance with IEC 60904-2 and IEC 60904-6. All data shall be taken at wind-speeds of less than 1 m/s. 10.7.3 Procedure

The module under test shall be mounted on a platform constructed of wood, pressed wood, or plywood, approximately 19 mm thick. The platform is to be painted flat black on the side facing the test sample. The platform shall extend at least 60 cm beyond the module on all sides. The module under test shall be mounted to the platform in accordance with the manufacturer's installation instructions. If the instructions offer more than one option, the option providing the worst-case shall be used. If no indications have been provided, the test module shall be mounted directly to the platform. The module component temperatures shall be measured by a calibrated device or system, with an maximum uncertainty of ± 2 °C. The module is to be operated under both open- and short-circuit conditions, and stabilised temperature data for each test location shall be collected in each condition. Thermal stability has been attained when three successive readings, taken 5 min apart, indicate a change in temperature of less than ± 1 °C. The measured component temperatures ( T obs ) shall be normalised by the addition of the difference between the 40 °C reference ambient and the measured ambient temperature ( T amb) according to the equation Tcon = T obs + (40 ­ Tamb ) Tcon is the normalised temperature. If an unacceptable performance is encountered during the temperature test and the performance is attributed to a test condition that although within the limits specified may be considered more severe than necessary; for example an ambient temperature near the limits allowed, the test may be conducted under conditions closer to the norm. If the irradiance is other than 1 000 W/m 2 , temperatures for more than two irradiance levels with at least 80 W/m 2 apart between the levels shall be determined, and a quadratic extrapolation conducted to determine the temperature under 1 000 W/m 2 irradiance.

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Typical measurement points include: · · · · · · · · Module superstrate above the centre cell. Module substrate below the centre cell. Terminal enclosure interior surface. Terminal enclosure interior air space. Field wiring terminals. Insulation of the field wiring leads. External connector bodies (if so equipped). Diode bodies (if so equipped).

NOTE Due to the many possible variations in construction, more than one data gathering point for each cited location may be used, at the discretion of the test laboratory.

10.7.4

Requirements

The requirements are as follows: a) No measured temperatures exceed any of the temperature limits of surfaces, materials, or components, as described in Table 9; or b) No creeping, distortion, sagging, charring or similar damage to any part of the module, as indicated in 10.1. Table 9 ­ Component temperature limits
Part, material or component Temperature limits °C

Insulating materials: Polymeric Fiber

c) a)

90 125 150 30 above ambient
d) a)

Laminated phenolic composition Molded phenolic composition Field wiring terminals, metal parts Field wiring compartments that wires may contact Insulated conductors Mounting surface (frame) and adjacent structural members
a) b)

or

d)

, whichever is greater, or

b)

d)

90

The material's relative thermal index (RTI), less 20 °C. If a marking is provided to state the minimum temperature rating of the conductors to be used, the terminals at points within a wiring compartment may exceed the value specified but shall not attain a temperature higher than 90 °C. Higher temperatures than specified are acceptable if it can be determined that the higher temperatures will not cause a risk of fire or electric shock. Temperatures measured on insulated conductors shall not exceed the rated temperature of the conductor.

c)

d)

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IS/IEC 61730-2 : 2004

10.8 Fire test MST 23 10.8.1 Purpose

These requirements establish the fundamental fire resistance of PV modules serving either as roof covering materials or mounted onto a building over an existing roof. These modules may be exposed to fire conditions, and therefore need to indicate their fire-resistance characteristics when exposed to a fire source originating from outside the building on which they are installed. The modules are not required to function after the test.
NOTE These tests specify fundamental requirements and may not be sufficient to satisfy the requirements for a module intended for building applications according to local or national building code requirements. Additional testing, beyond or in addition to these cited tests, may be required.

The fire resistance classes range from Class C (fundamental fire resistance), to Class B to Class A (highest fire resistance). A minimum fire resistance rating of Class C is necessary for any building-mounted module. Certification to a higher level may be considered in order to satisfy specific application requirements. 10.8.2 Approach

A PV module used in place of classified roofing material or mounted to or above an existing classified roofing material needs to comply with a single burning brand and spread of flame test, in accordance with the test outlined in Annex A, which are based on ANSI/UL 790. Sufficient samples shall be provided to create a single test assembly for a single spread of flame and a single burning brand test. Products that comply with these tests are not readily flammable, afford a measurable degree of fire protection to the roof deck, do not slip from position, and are not expected to produce flying brands. 10.8.3 Pass criteria

The PV module system shall attain a fire resistance classification by compliance with the stated requirements of Annex A. Compliance with a single burning brand and spread of flame test is required for modules mounted over an existing roof covering. Additional sequential testing, such as that outlined in ANSI/UL 790, is required for modules acting as a roof covering material.
NOTE It is the intention of IEC Technical Committee 82 to use international standards, such as ISO 834, for fire resistance testing PV modules. Until this standard is available, the tests described here will be required as minimum safety qualification.

10.9 Reverse current overload Test MST 26 10.9.1 Purpose

Modules contain electrically conductive material, contained in an insulating system. Under reverse current fault conditions, the tabbing and cells of the module are forced to dissipate energy as heat, prior to circuit interruption by an over-current protector installed in the system. This test is intended to determine the acceptability of the risk of ignition or fire from this condition.

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IS/IEC 61730-2 : 2004

10.9.2

Procedure

The module under test is to be placed with its superstrate face down onto a 9 mm thick soft pine board, covered by a single layer of white tissue paper. The back surface of the module shall be covered with a single layer of cheesecloth. The cheesecloth is to be untreated cotton cloth, running 26 m 2 /kg to 28 m 2 /kg and have a "thread count" of 32 by 28. Any blocking diode provided shall be defeated (short-circuited). The test shall be conducted in an area free of drafts. The irradiance on the cell area of the module shall be less than 50 W/m 2 . A laboratory DC power supply shall be connected to the module with positive output connected to the positive terminal of the module. The reverse tests current ( I test ) shall be equal to 135 % of the module's overcurrent protection rating, as provided by the manufacturer. The test supply current should be limited to the value of I test , and the test supply voltage shall be increased to cause the reverse current to flow through the module. The test shall be continued for 2 h, or until ultimate results are known, whichever occurs first.
NOTE Concerning the maximum overcurrent protection rating, see 12.2 of IEC 61730-1.

10.9.3

Pass criteria

The pass criteria are as follows: a) There shall not be flaming of the module, nor flaming or charring of the cheesecloth and tissue paper in contact with the module. b) MST 17 shall meet the same requirements as for the initial measurements. 10.10 Module breakage test MST 32 10.10.1 Purpose

The purpose of this test is provide confidence that cutting or piercing injuries can be minimized if the module is broken. 10.10.2 Background

The test described herein is derived from ANSI Z97.1, Impact test. 10.10.3 Apparatus

The apparatus is as follows: a) Impactors shall be leather punching bags of similar shape and size. The bag shall be filled to the required weight using chilled lead shot or pellets (2,5 mm to 3,0 mm in diameter ­ No. 7½ shot). Figure 4 shows the designs for the impactor bag. The exterior of the bag shall be wrapped with tape as shown in the figures. During testing, the impactor shall be completely covered with a 1,3 cm wide glass filament reinforced pressure sensitive tape. (See Figure 4).

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IS/IEC 61730-2 : 2004

b) A test frame similar to that shown in Figures 5 and 6 shall be provided to minimize movement and deflection during testing. The structure framing and bracing shall be steel channel (approximately C100 mm × 200 mm) or larger and shall have a minimum moment of inertia of approximately 187 cm 4 . The frame shall be welded or securely bolted at the corners to minimize twisting during impact. It shall also be bolted to the floor to prevent movement during impact testing. c) When an impactor bag is filled with lead shot, it will weigh approximately 45,5 kg, and will be capable of delivering 542 J of kinetic energy when swung through a 1,2 m vertical drop. 10.10.4 Procedure

Mount the module sample so that it is centered and rigid on the test frame using the method described by the manufacturer. The procedure is as follows: a) At rest, no more than 13 mm from the surface of the module sample and no more than 50 mm from the center of the module sample. b) Lift the impactor to a drop height of 300 mm from the surface of the module sample, allow the impactor to stabilize, and then release it to strike the module sample. c) If no breakage occurs, repeat the sequence of b) from a drop height of 450 mm. If still no breakage occurs, repeat from a distance of 1 220 mm. 10.10.5 Pass criteria

The module shall be judged to have successfully passed the module breakage test if it meets any one of the following criteria: a) When breakage occurs, no shear or opening large enough for a 76 mm (3-inch) diameter sphere to pass freely shall develop. b) When disintegration occurs, the ten largest crack-free particles selected 5 min subsequent to the test shall weigh no more in grams than 16 times the thickness of the sample in millimetres. c) When breakage occurs, no particles larger than 6,5 cm shall be ejected from the sample. d) The sample does not break.
2

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IS/IEC 61730-2 : 2004

Rod may be bent as shown or eye nut may be threated onto rod

Remove hanging strap

75 mm ± 25 mm

Worm-drive hose clamp (install before bag is taped)

26 mm ± 6 mm

Fill bag with lead shot so that total weight of assembly is 45 500 g ± 500 g

Metal sleeve 25 mm long x 32 mm diameter (series of metal washers may be used)

Tape bag with 13 mm wide tape. Use 3 rolls (165 m) and tape in diagonal, overlapping manner. Cover entire surface of bag. Tape neck separately. 330 mm ± 13 mm

8,0 mm or 10 mm threaded metal rod

76 mm ± 3mm

Eye nut for lifting bridle (see Figure 6)

Metal washers 5 mm ± 1,5 mm thick

IEC

1360/04

Figure 4 ­ Impactor

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IS/IEC 61730-2 : 2004

Stranded steel cable approximately 3 mm diameter

Concrete wall, steel beam, or other sturdy construction

915 mm min.

Bridle for lifting impactor, use stranded steel cable approximately 3 mm diameter 1 525 mm min.

Alternate means of bracing frame, use one brace at each vertical member

Drop height Centerline of test specimen

Maximum 13 mm when impactor is hanging free Test specimen

Bolt securely to floor

915 mm min. 1 525 mm min.
IEC 1361/04

Figure 5 ­ Impact test frame 1

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IS/IEC 61730-2 : 2004

Swivel attachment-locate at vertical centerline of test specimen and a minimum of 1 525 mm above horizontal centerline

This portion or frame not required if swivel attachment is mounted on separate construction

2 480 mm min.

Width of test specimen minus 20 mm

Height of test specimen minus 25 mm

Subframe members for test specimen smaller than 865 mm × 1 939 mm 1 525 mm min.

2 065 mm

IEC 1362/04

NOTE

Clamping frame for holding test specimen not shown.

Figure 6 ­ Impact test frame 2

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IS/IEC 61730-2 : 2004

11 Component tests
11.1 Partial discharge-test MST 15 The test refers to 4.1.2.4 of IEC 60664-1. 11.1.1 Purpose

Polymeric materials intend for use as a superstrate or substrate, without appropriate IEC insulation pre-qualification must comply with the partial discharge test. This test should applied to any polymeric material serving as a superstrate or substrate (see also IEC 61730-1). 11.1.2 Preconditioning

It is advisable to perform the partial discharge-test before inserting the reverse side foil into the PV modules. 11.1.3 Apparatus

Calibrated charge measuring device or radio interference meter according to IEC 60664-1. 11.1.4 Procedure

The procedure is as follows: a) According to C.2.1 and Clause D.1 of IEC 60664-1, starting from a value below the maximum system voltage, up to the point at which partial discharge takes place (inception voltage), the test voltage shall be further increased by 10 %. b) The voltage shall then be lowered to the point at which the partial discharge extinction voltage is reached. c) The extinction voltage shall be considered to be reached once the charge intensity has dropped to a value of 1 pC. This voltage shall be measured with an accuracy better than 5 %. d) The partial discharge extinction voltage may be influenced by environmental conditions. These influences are taken into account by a basic safety factor F 1 of 1,2. e) The hysteresis factor according to 4.1.2.4 of IEC 60664-1 is reduced to 1. The additional safety factor for reinforced insulation F 3 = 1,25 is required for safety class A. The initial value of the test voltage is therefore 1,5 U OC (system voltage given by the module manufacturer). f) Repeat the measurement with 10 test samples. Pass criteria

11.1.5

The solid insulation has passed the test if the mean value minus the standard deviation of the partial discharge extinction voltage is greater than 1,5 times the given maximum system voltage.

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IS/IEC 61730-2 : 2004

11.2 Conduit bending test MST 33 11.2.1 Purpose

Modules provided with junction boxes intended for attachment of a permanent wiring system using conduit must provide assurance of the ability of the box construction to withstand load forces which may be applied to the conduit during and after installation. 11.2.2 Procedure

Two 460-mm lengths of proper trade size conduit with appropriate fitting for the box shall be assembled and installed onto the box on opposing surfaces. For boxes intended for use with non-metallic conduit, the conduit test lengths are to be to welded to the fittings and allowed to dry no less than 24 h prior to assembly. The test assembly, with the box at the centre, is to be placed on supports as illustrated in Figure 7. The supports are to be separated by a distance of 760 mm plus the distance between the ends of the conduit in the box, to give the required bending moment on the sample under test. The load specified in Table 10 for the size of conduit used, is to be suspended from the centre of the box for 60 s. During this time, the box and the lengths of conduit shall be rotated through one complete revolution about the major axis of the assembly. 11.2.3 Pass criteria

The attachment walls of the module junction box shall not rupture or separate from the conduit.
NOTE If breakage of the conduit occurs prior to damage to the box or separation of the joint, performance of the box is considered acceptable.

Table 10 ­ Bending loads
Trade size of conduit mm Force load N

13 to 25 26 to 50 51 to 100

220 330 490

Box under test

Conduit Support Pulley

Conduit Support Flexible loop

Load

IEC 1363/04

Figure 7 ­ Test fixture assembly

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IS/IEC 61730-2 : 2004

11.3 Terminal box knockout tests MST 44 11.3.1 Purpose

Removable hole covers in the walls of module terminal enclosures (knockouts) shall remain in place under nominal force application and also be easily removed for the field application of permanent wiring system components. 11.3.2 Condition

A sample of the polymeric terminal box with knockouts will be tested in an "as-received" condition at a 25 °C ambient temperature. Another sample of the polymeric box is to be conditioned for 5 h in air maintained at ­20 °C ±1 °C. The test shall be repeated on the box immediately following this conditioning. 11.3.3 Procedure

The knockout shall be easily removed without leaving any sharp edges or causing any damage to the box. The procedure is as follows: Step 1 ­ A force of 44,5 N shall be applied to a knockout for 1 min by means of a mandrel, minimum 38 mm long by 6,4 mm diameter, with a flat end. The force is to be applied in a direction perpendicular to the plane of the knockout and at the point most likely to cause movement. Wait 1 h and measure the displacement between the knockouts and the box. Step 2 ­ The knockout shall then be removed by means of a screwdriver, used as a chisel. The edge of a screwdriver blade may be run along the inside edge of the resulting opening once only, to remove any fragile tabs remaining along the edge. Step 3 ­ Repeat steps 1 and 2 on two additional knockouts. For a box employing multi-stage knockouts, there shall be no displacement of a larger stage when a smaller stage is removed. 11.3.4 Pass criteria

The knockout shall remain in place after the application of the steady force and the clearance between the knockout and the opening shall not be more than 0,75 mm when measured. The knockout shall be easily removed without leaving any sharp edges or causing any damage to the box.

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IS/IEC 61730-2 : 2004

Annex A (normative) Fire tests, spread-of-flame and burning-brand tests

A.1

General

The fire resistance test of this document is a basic test. For PV modules integrated in buildings, in general, national regulations and requirements shall be fulfilled. If such requirements are not available, the following international standards gives information for tests, which could be used: ISO 834-1, Fire-resistance tests ­ Elements of building construction ­ Part 1: General requirements ISO 834-3, Fire-resistance tests ­ Elements of building construction ­ Part 3: Commentary on test method and test data application ISO 5657, Reaction to fire tests ­ Ignitability of building products using a radiant heat source The proposed tests described below are derived from ANSI/UL 790. All dimensions are approximate.

A.2

Test apparatus and set-up

A.2.1 As illustrated in Figure A.1, the apparatus used for the tests described in this Clause is to consist of the following: a) A test deck to which the materials to be tested are applied, mounted on a frame. The pitch of the frame is to be adjustable. b) A construction of non-combustible boards, mounted on the front of the frame to simulate eaves and cornices. c) A gas burner (for intermittent-flame, spread-of-flame, and flying brand tests) consisting of a 1,12 m length of nominal 50 mm (60,3 mm OD) pipe having a 12,7 mm wide, 910 mm long slot in the side toward the test deck. The burner is to be supplied with gas at both ends through nominal 25 mm (33,4 mm OD) pipe to provide uniform gas pressure at the burner assembly. d) A blower and air duct for providing the required wind conditions. The air introduced by the blower is to be taken from outside the test room. e) Adjustable fins mounted inside the air duct to straighten the air stream and reduce turbulence. f) A baffle mounted on the back edge of the test deck to prevent backfiring under the deck. g) Non-combustible boards extending from the sides and bottom of the air duct to the simulated eaves-and-cornice construction mentioned in b) (not used during burning brand test).

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IS/IEC 61730-2 : 2004

A.2.2 The tests shall be conducted in a room vented to the outside air to relieve the air pressure created by the blower. During these tests, all doors and windows in the room are to be closed, and the room otherwise controlled as necessary to prevent outside wind and weather conditions from affecting the test results. Tests shall not be conducted if the room temperature is less than 10 °C or more than 32 °C. A.2.3 For these tests, mortar (cement mix, lime, and water) shall be troweled into the joint formed by the leading edge of the roof covering material and the framework of the carriage, to prevent air or the test flame from travelling under the material being tested. A.2.4 During the tests, the test decks shall be subjected to an air current that flows uniformly over the top surface of the roof covering material, as determined by a pre-test calibration of the equipment using a bare 1 m by 1,3 m plywood deck. At points mid way up the slope of the bare deck, with the deck positioned at an incline of 127 mm of rise to 300 mm of horizontal run, the velocity of the air current is to be (19 ± 0,8) km/h, as measured at the centre and at each of two locations measured 76 mm from each edge of the deck, with each measurement being 94 mm above the surface of the deck. Any direct reading instrument with scale graduated in increments of not more than 6 m/min or any timed instrument with scale graduated (for a 1 min timed reading) in increments of not more than 1,5 m/min is acceptable. A.2.5 For these tests, the test decks shall be at an incline of 127 mm per 300 mm; except that built-up roof coverings are to be tested at the maximum incline recommended by the manufacturer, but not more than 127 mm to 300 mm.
Thermocouple f 94 mm Wind-speed meter nozzle 25 mm 12,5 mm c a 1,3 m b 343 mm 300 mm 890 mm 273 mm g 1,1 m Floor level 343 mm 762 mm d

838 mm 1,5 m (For burning brond test) Side view

g Location for wind-speed measurement Thermocouple

d

e

1m

c

2,13 m

a

Gas supply line

Plan view

IEC 1364/04

The letters in the Figure correspond to the list in A.2.1.

Figure A.1 ­ Test apparatus for fire test

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IS/IEC 61730-2 : 2004

A.3

Spread-of-flame test

A.3.1 A test sample is to be mounted, and luminous gas flame applied, as described in 6.1 of ANSI/UL 790. The test is to be conducted with the module or panel oriented with respect to the test flame, such that the flame impinges only on the top surface of the module or panel. A.3.2 The sample area of the test material should be no less than 1 m in width for all classes, 1,82 m minimum length for fire safety class A, 2,4 m minimum length for fire safety class B, or 3,9 m minimum length for fire safety class C, as measured from the leading edge of the sample. A.3.3 For a fire safety class A or B test, the gas flame is to be applied continuously for 10 min or until the spread of flame (flaming of the material being tested) permanently recedes from a point of maximum spread, whichever is the shorter duration. For a fire safety class C test, the gas flame is to be applied for 4 min and then removed. A.3.4 During and after the application of the test flame, the test sample is to be observed for the distance to which flaming of the material has spread, production of flaming or glowing brands, and displacement of portions of the test sample. The observation is to continue until the flame has permanently receded from a point of maximum spread.

A.4
A.4.1

Burning brand test
General

A test deck is to be mounted as described in 6.1 of ANSI/UL 790, except that the framework is to be 1,5 m from the air duct outlet (see Figure A.1), and the gas piping and burner are to be removed so as not to obstruct the air flow. A.4.2 Size and construction of brands

A.4.2.1 The brands to be used in these tests are to be as shown in Figure A.2 and are to be constructed as specified in A.4.2.2 to A.4.2.4. Prior to the test, the brands are to be conditioned in an oven at 40 °C to 49 ° C for at least 24 h. A.4.2.2 The fire safety class A brand is to consist of a grid, 300 mm square and approximately 57 mm thick, made of kiln-dried Douglas fir pine lumber that is free from knots and pitch pockets. The brand is to be made of 36 strips of lumber each 19,1 mm by 19,1 mm by 300 mm long, placed in 3 layers of 12 strips each, with strips placed 6,4 mm apart. These strips are to be placed at right angles to those in adjoining layers and are to be nailed, using 38,1 mm long, (No. 16 gage) nails, or stapled, using No. 16 gage steel wire staples having a 5,6 mm crown and 31,8 mm legs, at each end of each strip on one face, and in a diagonal pattern, as shown in Figure A.2, on the other face. The dry weight of the finished brand is to be (2 000 ± 150) g at the time of the test. A.4.2.3 The fire safety class B brand is to consist of a grid, 150 mm square and approximately 57 mm thick, made of kiln-dried Douglas fir lumber that is free from knots and pitch pockets. The brand is to be made of 18 strips of lumber 19,1 mm by 19,1 mm and 150 mm long, placed in 3 layers of 6 strips each, with strips spaced 6,4 mm apart. The strips are to be placed at right angles to those in adjoining layers and are to be nailed, using

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IS/IEC 61730-2 : 2004

38,1 mm long (No. 16 gage) nails, or stapled, using No. 16 gage steel wire staples having a 5,6 mm crown and 31,8 mm legs, at each end of each strip on one face, as shown in Figure A.2, and in a diagonal pattern on the other face. The dry weight of the finished brand is to be (500 ± 50) g at the time of the test. A.4.2.4 The fire safety class C brand is to consist of a piece of kiln-dried non-resinous white pine lumber that is free from knots and pitch pockets. The brand is to measure 38,1 mm by 38,1 mm by 19,8 mm, and a saw-cut groove (kerf) 3,2 mm wide is to be cut across the centre of both the top and bottom faces to a depth of one-half the thickness of the brand, and at right angles to each other. The dry weight of the finished brand is to be (9,25 ± 1,25) g at the time of the test. A.4.3 Ignition of brands

A.4.3.1 Before application to the test deck, the brands are to be ignited so as to burn freely in still air, as described in A.4.3.2, A.4.3.3 or A.4.3.4, as applicable. The flame of the gas burner used to ignite the brands is to essentially envelop the brands during the process of ignition. The temperature of the igniting flame is to be (888 ± 10) ° C, measured 58,7 mm above the top of the burner. The burner is to be shielded from drafts. A.4.3.2 Fire safety class A brands are to be exposed to the flame for 5 min, during which time they are to be rotated to present each surface to the flame as follows: a) each (300 by 300) mm face for 30 s, b) each (57 by 300) mm face for 45 s, c) each (300 by 300) mm face again for 30 s. A.4.3.3 Fire safety class B brands are to be exposed to the flame for 4 min, during which time they are to be rotated to present each surface to the flame as follows: a) each (150 by 150) mm face for 30 s, b) each (7 by 150) mm face for 30 s, c) each (150 by 150) mm face again for 30 s. A.4.3.4 Fire safety class C brands are to be exposed to the flame for 2 min, during which time they are to be rotated so as to present each of the 38 mm by 38 mm faces to the flame for 1 min. A.4.4 A.4.4.1 Test conditions Fire safety class A test

A.4.4.1.1 A brand is to be placed on the surface of each test deck at the most vulnerable location (point of minimum coverage over deck joint) with respect to ignition of the deck, but in no case closer than 100 mm from either side or 300 mm from the top or bottom edge of the test sample. The brand is to be placed so that the strips in both the upper and lower layers are parallel to the direction of air flow. The brand is to be secured to the deck by a soft-iron wire. A.4.4.1.2 The brand shall be placed so that it is centered on the test sample, or in the location where the test sample is most vulnerable to ignition.

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IS/IEC 61730-2 : 2004

A.4.4.2

Fire safety class B test

A brand is to be placed on the surface of the test sample at each of the two most vulnerable locations with respect to ignition of the sample (see 8.4.2.2 of ANSI/UL 790). Each brand is to be positioned with its upper edge no closer than 152 mm from each side or 300 mm from the top or bottom edge of the sample. The brands are to be placed so that the strips in both the upper and lower layers are parallel to the direction of air flow. They are to be secured to the deck by a soft-iron wire (No. 18 B&S gage (0,82 mm)). The second brand is not to be applied until all burning resulting from the first brand has ceased. A.4.4.3 Fire safety class C test

Twenty ignited brands are to be placed on each treated wood shingles deck at 1 min or 2 min intervals. No brand is to be placed closer than 100 mm to the point where a previous brand was located. See 8.4.3.2 (ANSI/UL-790) for securing of brands in place and relative positioning of brand saw kerfs. A.4.5 Duration of test

Each individual test, whether fire safety class A, B, or C, is to be continued until the brand is consumed and until all evidence of flame, glow, and smoke has disappeared from both the exposed surface of the material being tested and the underside of the test deck, or until unacceptable results occur, but not for more than 1,5 h for a fire safety class A or B test. The results of tests in which the brands do not show progressive and substantially complete consumption after application to the test sample shall be disregarded.
19,1 mm × 19,1 mm (Typical)

19,1 mm × 19,1 mm (Typical)

300 mm

150 mm 19,8 mm 38,1 mm 38,1 mm A B C
IEC 1365/04

300 mm

150 mm

Figure A.2 ­ Burning brand construction

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IS/IEC 61730-2 : 2004

A.5

Observations

During the tests, observations shall be made for the appearance of sustained flaming on the underside of the test deck, production of flaming or glowing brands of roof covering material, displacement of the test sample, and the exposure or falling away of portions of the roof deck.

A.6

Conditions of acceptance

At no time during the spread-of-flame or burning-brand tests shall: a) Any portion of the module or panel be blown off or fall off the test deck in the form of flaming or glowing brands. b) Portions of the roof deck, or portions of a module or panel intended for installation integral with or forming a part of the building roof structure, fall away in the form of glowing particles. c) The flame spread beyond 1,82 m for fire safety class A, 2,4 m for fire safety class B, or 3,9 m for fire safety class C rating. The flame spread is to be measured from the leading edge of the sample. d) There be significant lateral spread-of-flame from the path directly exposed to the test flame. Spread-of-flame includes flaming on both the top surface (the surface to which the external flame is applied) and in any intermediate channel, such as the space between stand-off or integral modules and the roof.

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IS/IEC 61730-2 : 2004

Bibliography
IEC 60068-2-21:1999, Environmental testing ­ Part 2-21: Tests ­ Test U: Robustness of terminations and integral mounting devices IEC 60364-1:2001, Electrical installations of buildings - Part 1: Fundamental principles, assessment of general characteristics, definitions IEC 60529:1989, Degrees of protection provided by enclosures (IP Code) IEC 61345:1998, UV test for photovoltaic (PV) modules IEC 61721:1995, Susceptibility of a photovoltaic (PV) module to accidental impact damage (resistance to impact test)

___________

34

(Continued from second cover) International Standard IEC 61215 : 2005 Crystalline silicon terrestrial photovoltaic (PV) modules -- Design qualification and type approval IEC 61730-1 : 2004 Photovoltaic (PV) module safety qualification -- Part 1: Requirements for construction ISO/IEC 17025 : 2005 General requirements for the competence of testing and calibration laboratories Corresponding Indian Standard IS 14286 : 2010 Crystalline silicon terrestrial photovoltaic (PV) modules -- Design qualification and type approval (first revision) IS/IEC 61730-1 : 2004 Photovoltaic (PV) module safety qualification: Part 1 Requirements for construction IS/ISO/IEC 17025 : 2005 General requirements for the competence of testing and calibration laboratories (first revision) Degree of Equivalence Identical

do

do

The technical committee has reviewed the provisions of the following International Standards referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard IEC 60904-6 : 1994 IEC 61140 : 2001 Title Photovoltaic devices -- Part 6: Requirements for reference solar modules Protection against electric shock -- Common aspects for installation and equipment Thin-film terrestrial photovoltaic (PV) modules -- Design qualification and type approval Non-metallic outlet boxes, flush device boxes and covers Tests for fire resistance of roof covering materials Flat -- Plate photovoltaic modules and panels American national standard for safety glazing materials used in buildings -- Safety performance specifications and method of test

IEC 61646 : 1996

ANSI/UL 514C ANSI/UL 790 ANSI/UL 1703 ANSI Z97.1

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 `Rules for rounding off numerical values (revised)'. The number of significant places retained in the rounded off value should be same as that of the specified value in this standard.

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